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Coffee is a solution of organic substances in water.
Sports drinks contain sugar, salt, and flavorings dissolved in water. They can be made more or less sweet by adding different amounts of sugar.
Brass is a combination of a number of elements. Its exact composition can vary.
Caffeine contains hydrogen, carbon, nitrogen, and oxygen atoms in a fixed ratio.
To separate a mixture of hard candies and marbles, the most efficient method would be .
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